§ 7.08. Streets.
A.
Street classification definitions.
Street Classification Functions—Uses Local Carries traffic from residential areas to collector roadways and interconnects individual lots. Short in length, non-continuous to discourage through traffic. Local streets carry light traffic volumes and trips are of a short duration. Collector Carries traffic from local streets to arterials. Also may serve local facilities such as schools, churches. Uses served would include medium and high density residential, limited commercial facilities, elementary schools, some small offices and as direct access within industrial parks. Collector streets also carry heavy traffic to major commercial and industrial facilities from arterials. Uses would include office parks, industrial parks, and community level commercial facilities. Minor arterial Minor arterial street system should connect and expand the principal arterial system to accommodate trips of moderate length with somewhat lower level of travel mobility and a higher level of land access than a principal arterial system. Principal arterial The main function of the principal arterial is to carry traffic from one urban area to another. The principal arterial system serves the major activity centers of urbanized areas. The principal arterial is used for longer urban trips and carries a high portion of the total traffic with a minimum of mileage. B.
General requirements. Any roadway design criteria not addressed in these documents shall conform to the latest edition of AASHTO's Geometric Design of Highways and Streets and the Texas Manual on Uniform Traffic Control Devices. The following general requirements apply to street improvements:
1.
Adequate streets shall be provided by the subdivider. The arrangement, character, extent, pavement width, right-of-way width, grade and location of each street shall conform to the comprehensive master plan. Each street shall be considered in its relation to existing and planned streets, topographical conditions, significant natural features such as mature trees or water courses, public safety and convenience, and its relationship to the proposed uses of land to be served by such street.
2.
Whenever a tract to be subdivided abuts any part of any street so designated on the comprehensive master plan, or where a street designated on the comprehensive master plan crosses any part of the tract to be subdivided, such part of the proposed public street shall be designed and platted. The entire right-of-way shall be dedicated, and the street shall be constructed by the subdivider only to the extent required by section 1.15 of this ordinance. The city may participate in the construction cost of any over sizing of roadways required to serve land areas and improvements beyond the subdivision. A rough proportionality analysis shall determine the difference between the cost of the oversized facility and the cost of the facility required to serve the proposed development.
3.
Additional right-of-way dedication (other than that required along roadways designated on the comprehensive master plan) shall not be required from a previously platted property where:
a.
The plat of such property is being modified by an amending plat.
b.
The plat of such property is being modified by a replat.
(1)
The property is occupied by a building or buildings; and
(2)
The sole purpose of the replat is to remove previously platted fire lanes, easements, mutual access easements, or delineate the legal boundaries of ownership of the property; and
(3)
No additional development rights will be conveyed to the property as a result of the replat.
4.
All streets shall be designed to coordinate with existing streets in adjoining subdivisions.
5.
Local streets shall intersect with collectors which shall intersect with arterials. Local streets generally shall not intersect with arterials. Connection shall only be permitted where design conditions do not permit any other possibility.
6.
Streets shall be named to provide continuity with existing streets. Names of new streets shall not duplicate or cause confusion with the names of existing streets. All street names shall be approved by the planning and zoning commission upon recommendation of the fire chief. A street which is, or is planned as, a continuation of an existing street shall bear the same name.
7.
Where adjoining areas are not subdivided, the arrangement of streets in the subdivision shall make provision for the proper projection of streets into such unsubdivided area.
8.
Streets should be platted to allow two tiers of lots between streets.
9.
The reservation in private ownership of strips of land at the end of proposed or existing streets and intended solely or primarily for the purpose of controlling access to property not included in the subdivision shall be prohibited.
10.
Half streets shall be prohibited, except divided arterial streets where essential to the reasonable development of the subdivision in conformity with the other requirements of these regulations, and where the commission finds it will be reasonable to require the dedication of the other half when the adjoining land is subdivided. The other half of the street shall be platted within the adjacent tract at the time it is platted.
11.
Eyebrows or partial cul-de-sacs are not permitted on arterial or collector roadways.
C.
Cul-de-sacs.
1.
Streets designated to be dead-ended permanently shall be platted and constructed with a paved cul-de-sac. Any dead-end street of a temporary nature, if longer than 200 feet, measured from the curbline of the intersecting street, shall have a surfaced turning area 100 feet in diameter, measured from face of curb, for a cul-de-sac. Temporary dead-end streets shall have provisions for future extension of the street and utilities and, if the temporary cul-de-sac is utilized, a reversionary right to the land abutting the turnaround for excess right-of-way shall be provided.
2.
A street ending permanently in a cul-de-sac shall not be longer than 600 feet, measured from the center of the cul-de-sac to the curbline of the intersecting street. It shall be provided, at the closed end, with a turnaround having an outside roadway diameter of at least 80 feet, measured from face of curb, and a street property line diameter of at least 100 feet.
D.
Street class requirements.
1.
Street layout shall provide for continuation of collector roadways in areas between arterials.
2.
Those local streets designated by the planning and zoning commission shall be extended through the tract to the tract boundary to provide future connection with adjoining unplatted lands. In general, these extensions should be at such intervals as necessary to facilitate internal vehicular circulation with adjoining unplatted lands.
3.
Where single family or duplex uses abut an existing or proposed arterial roadway, the plat or dedication instrument shall provide:
a.
Lots to side onto the arterial with a non-access restriction on the arterial side;
b.
Reverse frontage with screening and containing a non-access restriction along the rear property line (the arterial side);
c.
Lots with screened rear alleys; or
d.
Other treatment as may be necessary or required for adequate protection of adjoining properties, and as approved by the city council after taking into consideration the proposed method of off-street parking and maneuvering which will prevent the necessity of backing into the arterial street.
E.
Street design criteria—General provisions.
1.
All dedicated streets shall conform to the following:
DESIGN CRITERIA
Street Classification Designation Minimum Right-of-Way *Minimum Roadway Width No. of Lanes and Width Parking Lanes and Width Median Width Minimum Parkway Width—Sidewalks Required Principal Arterial P6D 120' (2) 36' 6 lanes - 12' None 28' 10' - Yes P6U 92' 72' 6 lanes - 12' None None 10' - Yes P7U 104' 84' 7 lanes - 12' None None 10' - Yes Minor Arterial M4D 100' (2) 26' 2-12' & 2-14' None 28' 10' - Yes M4U 68' 48' 4 lanes - 12' None None 10' - Yes M5U 80' 60' 5 lanes -12' None None 10' - Yes Collector C 60' 40' 2-12' & 2-8' 2 - 8' None 10' - Yes Local L 50' 30' 1-14' & 2-8' 2 - 8' None 10' - Yes *Minimum Roadway Width is from face of curb to face of curb. Additional right-of-way will be required at most intersections and may be required at high-volume driveways to provide left and right turn lanes to maintain traffic volume capacities through the intersections. Also, additional utility easements may be required beyond the right-of-way.
2.
The dedicated streets shall conform to the following minimal parameters:
_____Street Classification Minimum Design Speed (MPH) Maximum Percent Grade Minimum Percent Grade Minimum Centerline Radius (without superelevation) Local 20 10 0.6 200' Collector 30 8 0.6 450' Minor and Principal Arterial 45 6 0.6 1100' 3.
Roadway connection spacing criteria along collector and arterial roadways. Roadway connection spacing shall be defined as the distance between connections and is measured from the closest edge of pavement of the first connection to the closest edge of pavement of the second connection along the edge of the traveled roadway.
The following table details the minimum connection spacing criteria. It should be noted that deviation from these guidelines will be considered only for cases where not granting the deviation would deny the property reasonable access.
Posted
Speed (mph)Minimum
Connection
Spacing (ft)≤ 30 200 35 250 40 305 45 360 ≥ 50 425 Along existing or planned divided roadway facilities, median opening spacing criteria shall be based upon the minimum connection spacing criteria and any required turn storage and deceleration lengths needed to accommodate projected turning traffic volumes.
4.
No street intersecting an arterial roadway shall vary from a 90° angle of intersection by more than 5°. Intersections of collector and local roadways shall not vary from 90° by more than 15°. An intersecting street must have a straight segment at least 50 feet in length that meets the angle of intersection requirements before the curbline of the street it is intersecting.
5.
Horizontal curves are required for deflection angles of 1° or more.
6.
At an intersection, the vertical profile of the higher classification roadway (or roadway that will carry more traffic) shall be smooth and continuous through the intersection. The cross slope of the intersecting street shall transition from its normal crown section to match the longitudinal vertical profile of the street which it intersects. The length of this cross slope transition shall be designed per AASHTO criteria based on design speed, cross slope grade differential, width of rotated section, and number of lanes rotated.
7.
Corner radii at the intersection of two Local roadways shall be 25 feet radius minimum. Larger radii may be required for intersections of higher classification roadways per AASHTO design criteria.
8.
A five-foot × five-foot minimum triangular right-of-way corner clip dedication is required at roadway intersections to be able to accommodate sidewalk barrier free ramps (see standard details). This corner clip may need to be increased for larger intersection corner radii and at skewed intersections.
9.
Roadway profiles shall be designed so that they are graded at two percent maximum where crosswalks are (or will be) located.
10.
The intersection sight distance for all street intersections shall be analyzed by the design engineer per the latest edition of AASHTO's Geometric Design of Highways and Streets. The approach and departure sight triangles shall be plotted on the construction plans in order to ensure that no obstructions are constructed within these areas.
F.
Pavement types. A geotechnical report sealed by a licensed professional engineer in the state shall provide recommendations for pavement and subgrade thickness and lime or cement content. The minimum thicknesses are provided below. All concrete shall be class A (per Item 303) minimum.
1.
For local streets, the developer shall construct six inches reinforced concrete on a minimum of eight inches of lime or cement stabilized subgrade.
2.
For collector roadways, the developer shall construct seven inches of reinforced concrete on ten inches of lime or cement stabilized subgrade.
3.
For arterial roadways, the developer shall construct eight inches of reinforced concrete on ten inches lime or cement stabilized subgrade.
G.
Driveway requirements.
1.
No residential driveways may access arterial roadways. Residential driveway access to collector roadways will only be allowed only when design conditions do not permit any other possibility.
2.
Any driveway proposed to connect to TxDOT facilities must be permitted through TxDOT and a copy of the signed permit will be required prior to issuance of a building permit.
3.
Driveway approaches shall be constructed of six-inch thick 3,000 psi compressive strength concrete reinforced with #3 steel bars on 18-inch centers each way. The driveway shall begin at the street curb and extend to the right-of-way line or to a point ten feet from the face of curb, whichever is greater. The drive approach at the right-of-way line, with a normal ten-foot parkway, shall be 0.2 feet higher than the top of curb as per the city standard details. The elevation at this location may be lower provided that barrier free ramps are provided to bring the sidewalk down to the driveway grade.
4.
Driveways shall be graded at a two percent maximum longitudinal slope in areas where sidewalks cross, so that the sidewalk crossing is at a two percent maximum cross slope.
5.
Width of driveway approaches: Residential driveway approaches shall not be less than 11 feet in width nor more than 18 feet wide measured at the property line. Commercial and industrial driveway approaches shall not be less than 24 feet in width nor more than 35 feet wide measured at the property line.
6.
Radius: Residential driveways shall be constructed with return curbs having a rolled face disappearing at the sidewalk and joining the street curb with a minimum five-foot radius and a maximum ten-foot radius. Commercial and industrial driveways shall have a minimum 25-foot radius and a maximum 30-foot radius.
7.
Angle of driveway approach: The angle of the driveway approach with the curb line shall be 90 degrees.
8.
Driveways shall be kept at a minimum of five feet away from obstructions such as street light poles, fire hydrants, traffic signal poles, etc.
9.
Driveway approaches shall not be constructed or designed for parking of vehicles or for use as angle parking.
10.
Driveway connection spacing criteria along collector and arterial roadways: Driveway connection spacing shall be defined as the distance between connections (or between driveways and roadways) and is measured from the closest edge of pavement of the first connection to the closest edge of pavement of the second connection along the edge of the traveled roadway.
The following table details the minimum connection spacing criteria. It should be noted that deviation from these guidelines will be considered only for cases where not granting the deviation would deny the property reasonable access.
Posted
Speed (mph)Minimum
Connection
Spacing (ft)≤ 30 200 35 250 40 305 45 360 ≥ 50 425 11.
Driveway approaches shall be located entirely within the frontage of the premises they serve except for joint-use, or cooperative, driveways which may be permitted for use by adjoining property holders. When the joint driveway approach is proposed, the request must be made by, and agreed to, by all the interested parties and all property owners involved. The design of the joint driveway facilities must be submitted with the request to be approved by the city engineer.
12.
Future maintenance of the driveway approach shall be the responsibility of the property owner.
H.
Signage and pavement markings.
1.
Street name signs shall be furnished and installed by the subdivider for all intersections within or abutting the subdivision.
2.
Street name signs shall be six inches extruded, have white lettering on a green background, be engineer grade reflectorized, and include the block numbers along with the street name.
3.
Stop signs shall be 24 inches × 24 inches in size and shall conform to the standards as set forth in the Texas Manual on Uniform Traffic Control Devices.
4.
All signs shall be of engineer grade reflective material and be located in accordance with the Texas Manual on Uniform Traffic Control Devices.
5.
The sign pole shall be buried to a minimum depth of two feet and placed in 12-inch diameter concrete filled posthole. The pole shall be tall enough to accommodate all applicable signs. The bottom of the stop sign shall be located seven feet above the finished grade of the surrounding ground.
6.
At a minimum the following signs are required to be posted within a subdivision: stop signs, street name signs, slow children at play signs, 20 mph speed limit signs, and weight limit six tons signs.
7.
All pavement markings shall be thermoplastic.
I.
Street lighting.
1.
Street lights in all developments shall be installed on city-approved metal poles.
a.
Poles must be approved by a public electric utility holding a city franchise and by the director of public works.
b.
Poles shall be contracted and paid for by the developer during the construction phase of the development and before building permits are issued.
c.
Poles not purchased through a public electric utility holding a city franchise, shall be certified by a licensed professional engineer in the state as meeting the specifications as required by a public utility company holding a city franchise, and shall be approved by the director of public works prior to purchase.
2.
The location of street lights shall be as follows:
a.
At all intersections.
b.
Where a new street intersects an existing street.
c.
Street lights shall be located in proximity to fire hydrants whenever possible.
d.
Where a block is 600 feet or longer, a street light shall be installed every 600 feet or mid-block, whichever is the shortest distance.
e.
If more than one mid-block street light is required, they shall be installed to create an equal balance of light throughout the entire block length.
f.
If a cul-de-sac block is 400 feet or longer, a street light shall be installed at the end of the cul-de-sac.
g.
Intersection street lights shall be 200-watt, high pressure sodium. Mid-block street lights shall be 100-watt, high pressure sodium.