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Traffic heat map of Gillespie County, Texas: 300 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Main Street and I 10

Gillespie County, Texas Traffic Counts

Its busiest road, Main Street, carries 15,124 vehicles a day, 3.8 times the average road. This page breaks down traffic in Gillespie County, Texas across 300 miles of monitored roads split into 2,742 segments, using multi-sourced mobile and sensor data. It goes beyond raw counts to truck flow, congestion and who is driving, so site selection and route planning rest on evidence.
Data sourced from TrafficZoom's proprietary analytics platform.
Data current as of:
Q3 2026
Updated:
September 29, 2026
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Total Traffic Volume & Performance in Gillespie County, Texas

Traffic

The average number of vehicles that travel each day over any road in the road network.

vehicles per day3,972
Trucks

The percentage of the total traffic volume composed of heavy vehicles.

10.6%
Average travel time

The average time of travel averaged among all vehicles traveling on the road network.

32.5 min
Congestion ratio

The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network.

9.3%
Drivers’ average age

Average age of residents in the geographic areas where the vehicle trips originated.

57.1 yrs
Drivers’ average income

Average income of residents in the geographic areas where the vehicle trips originated.

$74,328

The average monitored road in Gillespie County, Texas carries 3,972 vehicles per day. Across its 300 miles of monitored roads, that adds up to 869,985 vehicle-miles traveled per day (≈318 million per year). Trucks are 10.6% of traffic, close to the 9.8% across Texas.

Shorter trips than 72% of counties in Texas

At 3,972 vehicles per day, the average monitored road in Gillespie carries 42% less traffic than the state average of 6,895, suggesting less demand on each road - lighter roads for freight, but less passing trade for roadside retail. Network-wide, Gillespie accounts for about 0.1% of Texas's statewide total of vehicle-miles. By volume, Gillespie's 3,972 vehicles per day outpaces 69% of counties in Texas.

Journey times here (32.5 minutes on average) closely track the state level. 72% of counties in Texas have a longer average travel time than Gillespie's 32.5 minutes.

At 43% lower than the state level, the 9.3% congestion ratio signals smoother traffic flow - travel times are easy to plan around for scheduled deliveries.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Gillespie County, Texas

Trafficvehicles per day6,759
Trucks13.5%
Average travel time35.3 min
Congestion ratio9.3%
Drivers’ average age56.9 yrs
Drivers’ average income$75,567

A little more than half of the driving in Gillespie County, Texas happens on highways: 58% of all vehicle-miles. The average highway carries 6,759 vehicles per day, 154% more than the average non-highway road in the same area, which carries 2,666 vehicles per day.

With 30% of the road miles (89 miles in 875 segments), highways punch above their length, carrying 505,575 vehicle-miles traveled per day (≈185 million per year).

Fewer highway trucks than 65% of counties in Texas

Highway truck concentration here (13.5%) closely tracks the state average for similar road classifications. The highway traffic mix is typical for Texas: neither freight- nor commuter-dominated.

By truck concentration, highways here trail 62% of counties in Texas. Gillespie's highway truck count is lower than 65% of counties in Texas, at roughly 912 trucks per day.

non-highway traffic icon

Non-highway Traffic in Gillespie County, Texas

Trafficvehicles per day2,666
Trucks6.6%
Average travel time31.2 min
Congestion ratio9.3%
Drivers’ average age57.2 yrs
Drivers’ average income$73,179

Local roads carry a significant share of travel in Gillespie County, Texas: 42% of all vehicle-miles. On the average non-highway road, that comes to 2,666 vehicles per day.

Spread over 211 miles and 1,867 segments, 70% of the road network, local roads carry a lighter load per mile: 364,410 vehicle-miles traveled per day (≈133 million per year). Trucks make up 6.6% of non-highway traffic, about 1 in 15 vehicles.

Older drivers than 98% of counties in Texas

The concentration of trucks on non-highway roads is 51% lower than on highways.

Non-highway congestion (9.3%) runs 42% lower than the state average, pointing to smoother local traffic flow.

Gillespie's average driver income is higher than 66% of counties in Texas. 98% of counties in Texas have a younger driver population than Gillespie.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and a long afternoon plateau from 3:00 PM to 7:00 PM, with volumes reaching approximately 77% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 15% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
March–May is the high season, with volumes +4% versus the annual average.
Lowest month:
August is the quietest month, with volumes -6% versus the annual average - an unusual summer low, when most places are at their busiest.

Data Finding: Hourly & Seasonal Patterns

In Gillespie County, Texas, the peak hour concentrates about 7% of the day's traffic, and there is a noticeable seasonal swing of +4% in high season.

Gillespie County vs. Texas Traffic Comparison

Of the four measures, average daily traffic per road differs most: Gillespie County runs 42% below the Texas average.

MetricGillespie CountyTexas averageDifference
Traffic3,9726,895-42.4%
Truck % (Total Traffic)10.6%9.8%+8.6%
Truck % (Highway)13.5%13.8%-1.9%
Avg. Travel Time32.5 min32.6 min-0.5%

How Gillespie County compares

Gillespie County against nearby counties

Gillespie County tracks the 4 areas around it closely - no measure in this table sets it far apart from the areas immediately next to it, though it has the third busiest roads of the five.

Gillespie County and the 4 nearest county-level areas by centroid distance, with the Texas average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Gillespie County3,97210.6%869,98532.5 min9.3%
Llano County, Texas3,4938.1%603,19232.3 min8.9%
Mason County, Texas1,50811.3%184,99139.1 min4.5%
Blanco County, Texas4,5639.8%810,61846.8 min9.5%
Kerr County, Texas6,31213.6%1,481,50032.0 min16.2%
Texas average6,8959.8%N/A32.6 min16.4%

Gillespie County ranked within Texas

Average driver age places Gillespie County #5 of 254 in Texas - the top quarter of the state.

Gillespie County ranked among 254 county-level areas in Texas (1 = highest); measures without data in every county rank a smaller field, down to 227.
MeasureGillespie CountyTexas rank
Traffic volume (AADT)3,972#80 of 254
Highway vehicle-miles per day505,575#128 of 227
Truck share on highways13.5%#141 of 227
Highway trucks per day912#148 of 227
Average travel time32.5 min#183 of 254
Average driver income$74,328#86 of 254
Average driver age57.1 yrs#5 of 254

Busiest roads in Gillespie County, Texas

Traffic concentrates on a few corridors: the three busiest roads average 13,461 vehicles a day, against 3,972 on the average road in Gillespie County.

Main Street leads with 15,124 vehicles a day, 871 of them trucks (5.8%). I 10 carries the most trucks, 3,803 a day (27.1% of its traffic), although it ranks #2 for all traffic.

Trucks make up 27.1% of traffic on I 10, against 10.6% across all roads in the county.

I 10 carries longer journeys than most roads here, with a median trip of 52.2 minutes against 32.5 county-wide.

Few trucks use Adams Street: 4.7% of its traffic, under half the county's 10.6%.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Main StreetTrunk road · 15,124vehicles871trucks · 5.8%
Road class
Trunk road
Congestion ratio
20.7%
Median trip time
31.8 min
Drivers’ median age
57.3 yrs
Drivers’ average income
$70,053

Travel on Main Street's busiest stretch runs 21% over free-flow time, against 9% across the county, so expect slower peak hours.

2I 10Motorway · 14,034vehicles3,803trucks · 27.1%
Road class
Motorway
Congestion ratio
17.4%
Median trip time
52.2 min
Drivers’ median age
51.9 yrs
Drivers’ average income
$81,431

I 10 carries 3.5 times the county average at its busiest, 3,803 of them trucks (27.1%, above the county-wide 10.6%).

3Adams StreetPrimary road · 11,225vehicles529trucks · 4.7%
Road class
Primary road
Congestion ratio
22.2%
Median trip time
28.9 min
Drivers’ median age
57.8 yrs
Drivers’ average income
$72,591

Adams Street is one of the more congested roads here: trips take 22% longer than at free-flow speed, against 9% county-wide.

4US 290Trunk road · 8,565vehicles792trucks · 9.2%
Road class
Trunk road
Congestion ratio
10.0%
Median trip time
39.4 min
Drivers’ median age
57.5 yrs
Drivers’ average income
$70,123

US 290 carries 2.2 times the county average on its busiest stretch, where the median trip lasts 39.4 minutes.

5State Highway 16Primary road · 8,424vehicles586trucks · 7.0%
Road class
Primary road
Congestion ratio
16.3%
Median trip time
35.4 min
Drivers’ median age
56.8 yrs
Drivers’ average income
$74,877

At 2.1 times the county average, State Highway 16 draws drivers from neighborhoods averaging $74,877 in household income.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 10Motorway · #2 by traffic14,034vehicles3,803trucks · 27.1%
2Main StreetTrunk road · #1 by traffic15,124vehicles871trucks · 5.8%
3US 290Trunk road · #4 by traffic8,565vehicles792trucks · 9.2%
4US 87Trunk road · 6,456vehicles723trucks · 11.2%
Road class
Trunk road
Congestion ratio
6.7%
Median trip time
42.4 min
Drivers’ median age
53.0 yrs
Drivers’ average income
$74,082

Drivers on US 87 are on long journeys, a median 42.4 minutes against 32.5 county-wide: a through route more than a local street.

5State Highway 16Primary road · #5 by traffic8,424vehicles586trucks · 7.0%
How to read these road counts
  • The first number is AADT, annual average daily traffic: the vehicles passing a point on an average day, both directions combined and trucks included. On a divided highway both carriageways are added together.
  • Traffic changes along a road, with more near interchanges and towns and less in open country. Every figure for a road describes its busiest stretch in the county, so the two rankings show the same numbers for the same road.
  • The second number is the trucks on that stretch, a part of its AADT. The bar splits the AADT into cars and light vehicles (blue) and trucks (amber).
  • See segment-level AADT for any road on TrafficZoom.

Data Sources & Methodology

The data presented on this page is derived from TrafficZoom's proprietary analytics platform, which aggregates and normalizes information from multiple sources, including:

Mobile device location data (anonymized and aggregated)

Road sensor networks and traffic counters

Historical traffic pattern databases

Public traffic count programs published by the

GillespieDepartment of Transportation

Demographic Baseline for O-D Modeling

U.S. Census Bureau
All metrics represent estimates based on statistical modeling and are intended for strategic planning purposes.
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Data current as of:
Q3 2026

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Counties near Gillespie County

The same traffic breakdown for the areas closest to Gillespie County, Texas.

Need segment-level traffic data?

Identify traffic patterns street by street and analyze the exact corridors that matter to your project.